/*
 * Copyright (C) 2005 Junio C Hamano
 */
#include "cache.h"
#include "diff.h"
#include "diffcore.h"
#include "delta.h"

struct path_spec {
        const char *spec;
        int len;
};

static int matches_pathspec(const char *name, struct path_spec *s, int cnt)
{
        int i;
        int namelen;

        if (cnt == 0)
                return 1;

        namelen = strlen(name);
        for (i = 0; i < cnt; i++) {
                int len = s->len;
                if (! strncmp(s->spec, name, len) &&
                    len <= namelen &&
                    (name[len] == 0 || name[len] == '/'))
                        return 1;
        }
        return 0;
}

void diffcore_pathspec(const char **pathspec)
{
        struct diff_queue_struct *q = &diff_queued_diff;
        int i, speccnt;
        struct diff_queue_struct outq;
        struct path_spec *spec;

        outq.queue = NULL;
        outq.nr = outq.alloc = 0;

        for (i = 0; pathspec[i]; i++)
                ;
        speccnt = i;
        spec = xmalloc(sizeof(*spec) * speccnt);
        for (i = 0; pathspec[i]; i++) {
                spec[i].spec = pathspec[i];
                spec[i].len = strlen(pathspec[i]);
        }

        for (i = 0; i < q->nr; i++) {
                struct diff_filepair *p = q->queue[i];
                if (matches_pathspec(p->one->path, spec, speccnt) ||
                    matches_pathspec(p->two->path, spec, speccnt))
                        diff_q(&outq, p);
                else
                        diff_free_filepair(p);
        }
        free(q->queue);
        *q = outq;
        return;
}